For another POV with the same aim. Here is the hybrid build I settled on after ALOT of tests.
Hex: use it for the nostalgia, then spec out of it
Flamer: all offence(top route)
Siege Pulse: Always take DR at level 5(you knew that, does anyone take recharch speed?), pick the others according to your style. I use damage, for both but I'm considering going for shots at level 6. YMMV
Passive: Either, Either, Weapon damage(duh)
Fitness: Shield Restore, either( I reccomend shield restore), Squad Command
Weapon: Crusader(HVB) or GPS(Barrel). Either way, you need an omniblade. Other shotguns could also work, but you give up long range firepower.
Gear: Bezerker or Juggy Shield(lol)
If your gonna use consumables, a strength enhancer is good. So is Cyclonic Shields. Ammo is your choice. You can do quite a bit o damage with ammo that primes tech combo's however.
Basicly, the key to this build is: You heavy melee can actually kill things. But you still have enough shield restore to tank pretty well. Even without consumables, you heavy melee will eat basic troopers in 2-3 seconds and tier 2 guns in about 5 ish. If you get surrounded, your light melee also has decent damage.
How to play:
Siege Pulse: Use this in bursts. Make sure the cooldown is avaiable, fire off shots in quick succession(as much as possible, I know it's slow) and then re-activate it. Works great if your ammo will prime.
Turret: Use this to find enemies(see where it shoots) and drop it near them, then burst the flamer with siege pulse. When tanking bosses you can drop it behind you and the flammer will add to your damage.
Mooks that get near you can be heavy meleed without a problem. You should be able to kill them fast enough that you arn't delayed to long. You NEED an omniblade for this however. for bosses, drop the turret, then tank them if your group is nearby.
The real keys to this build are the fitness spec and the shotgun omniblade. You could change the other stuff around a bit to suit your style.